Power Rating: 100W continuous average power into 8 ohms at any frequency between 20Hz and 20kHz with both channels driven at less than 0.04% THD. 150W into 4 ohms.
IM Distortion (SMPTE): less than or equal to 0.02%
IM Distortion (CCIF): less than or equal to 0.009%
Frequency Response @ 1 Watt into 8 Ohms: +0, -0.25dB
Dynamic Headroom into 4 Ohms: 2.1dB
Signal-to-Noise Ratio, "A" Weighted, 100 watts into 8 ohms: >110dB

Manual can be downloaded/viewed here:
http://www.adcom-usa.com/userguides/gfa-545II-ug.pdf